package com.leoni.mvnbook.account.persist;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentFactory;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

public class AccountPersistServiceImpl implements AccountPersistService {

	private static final String ELEMENT_ROOT = "account-persist";
	
	private static final String ELEMENT_ACCOUNTS = "accounts";
	
//	private static final String ELEMENT_ACCOUNT = "account";
	
	private static final String ELEMENT_ACCOUNT_ID = "id";
	
	private static final String ELEMENT_ACCOUNT_NAME = "name";
	
	private static final String ELEMENT_ACCOUNT_EMAIL = "email";
	
	private static final String ELEMENT_ACCOUNT_PASSWORD = "password";
	
	private static final String ELEMENT_ACCOUNT_ACTIVATED = "activated";
	
	private String file;
	
	private SAXReader reader = new SAXReader();
	
	@Override
	public Account createAccount(Account account)
			throws AccountPersistException {
		return null;
	}

	@Override
	public Account readAccount(String id) throws AccountPersistException {
		
		Document doc = readDocument();
		Element accountsEle = doc.getRootElement().element(ELEMENT_ACCOUNTS);
		for (Element accountEle : (List<Element>)accountsEle.elements()) {
			if (accountEle.elementText(ELEMENT_ACCOUNT_ID).equals(id)) {
				return buildAccount(accountEle);
			}
		}
		
		return null;
	}

	@Override
	public Account updateAccount(Account account)
			throws AccountPersistException {
		return null;
	}

	@Override
	public boolean deleteAccount(String id) throws AccountPersistException {
		return false;
	}
	
	private Document readDocument() throws AccountPersistException {
		File dataFile = new File(file);
		if (!dataFile.exists()) {
			dataFile.getParentFile().mkdirs();
			Document doc = DocumentFactory.getInstance().createDocument();
			Element rootEle = doc.addElement(ELEMENT_ROOT);
			rootEle.addElement(ELEMENT_ACCOUNTS);
			writeDocument(doc);
		}
		
		try {
			return reader.read(dataFile);
		} catch (DocumentException e) {
			throw new AccountPersistException("读取用户配置信息xml文件出错", e);
		}
	}
	
	private void writeDocument(Document doc) throws AccountPersistException {
		Writer out = null;
		try {
			out = new OutputStreamWriter(new FileOutputStream(file), "UTF-8");
			XMLWriter writer = new XMLWriter(out, OutputFormat.createPrettyPrint());
			writer.write(doc);
		} catch (IOException e) {
			new AccountPersistException("写入用户配置信息xml文件出错", e);
		} finally {
			if (null != out) {
				try {
					out.close();
				} catch (IOException e) {
					throw new AccountPersistException("关闭文件输出流出错", e);
				}
			}
		}
	}
	
	private Account buildAccount(Element element) {
		Account account = new Account();
		account.setId(element.elementText(ELEMENT_ACCOUNT_ID));
		account.setName(element.elementText(ELEMENT_ACCOUNT_NAME));
		account.setEmail(element.elementText(ELEMENT_ACCOUNT_EMAIL));
		account.setPassword(element.elementText(ELEMENT_ACCOUNT_PASSWORD));
		account.setActivated("true".equals(element.elementText(ELEMENT_ACCOUNT_ACTIVATED)) ? true : false);
		return account;
	}
	
	public String getFile() {
		return file;
	}
	public void setFile(String file) {
		this.file = file;
	}

}
